<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<style>
    .header {
        border: 1px solid red;
        width: 100%;
        text-align: center;
    }
</style>


<div class="header">
    header
</div>